Patrick, R. and C.W. Reimer. 1966. The Diatoms of the United States exclusive of Alaska and Hawaii. Volume 1. Fragilariaceae, Eunotoniaceae, Achnanthaceae, Naviculaceae. Monographs of the Academy of Natural Sciences of Philadelphia 13: 688 pp., 64 pls.

Phycology Section, Patrick Center for Environmental Research, Academy of Natural Sciences of Drexel University. Achnanthes affinis (NADED 2001). https://diatom.ansp.org/taxaservice/ShowTaxon1.ashx?naded_id=2001. Accessed 14 Aug 2018. This web service reports all information about a given algae taxon available at the time of retrieval.